Semiconductor device, display device and electronic device

Abstract

A potential which is applied to a gate electrode of a driving transistor in accordance with an emission state or a non-emission state of a light-emitting element fluctuates due to noise or leakage from a selection transistor, or the like, which causes a problem in that the driving transistor cannot turn on or off normally and malfunctions. The present invention includes a transistor connected to a light-emitting element, a power source line, a scan line, a memory circuit, and a switching circuit, in which the transistor controls light emission or non light emission of the light-emitting element, and the switching circuit controlled by the scan line conducts switching between the transistor, and the memory circuit and the power source line, and applies an input potential to the transistor.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to semiconductor devices. In particular, the present invention relates to semiconductor devices using transistors. Further, the present invention relates to display devices including the semiconductor devices, and electronic devices including the display devices.[0003]Note that the term “semiconductor device” here includes general devices which can function by utilizing a semiconductive property.[0004]2. Description of the Related Art[0005]In recent years, self-luminous display devices having pixels formed with a light-emitting element such as a light-emitting diode (LED) are drawing attention. As examples of such light-emitting elements used in such self-luminous display devices, organic light-emitting diodes (also referred to as OLED (Organic Light-Emitting Diode), organic EL elements, and electroluminescence elements (also referred to as EL elements, or the like), have been drawing atten...

AI Technical Summary

Benefits of technology

The present invention provides a semiconductor device that includes a first transistor, a second transistor, a memory circuit, a switching circuit, and a third transistor. The first transistor is connected to a data line and a power source line, the second transistor is connected to a scan line and the first power source line, and the memory circuit is connected to the second transistor and a scan line. The switching circuit conducts switching between the third transistor, the memory circuit, and the second power source line, and applies an input potential to the third transistor. The semiconductor device can be used in a display device, which includes a display portion and a driver circuit. The technical effects of the invention include improved data transmission speed, reduced power consumption, and improved display quality.

Problems solved by technology

However, there is such a problem that a potential that has been accumulated in the storage capacitor to be applied to the gate terminal of the driving transistor may fluctuate due to noise, leakage from the selection transistor or the like, and thus the driving transistor may malfunction without being capable of keeping the normal on or off state.

In addition, there is another problem in that the power consumption is increased if the voltage amplitude of the data line is increased in order to prevent malfunctions of the driving transistor that would be caused by fluctuation of a gate potential of the driving transistor.

Thus, a semiconductor device having a conventional pixel configuration has a problem in that a potential applied to the gate terminal of the driving transistor fluctuates due to noise or a leakage from the selection transistor, which causes the driving transistor to malfunction.

Further, even if a signal having a large potential amplitude is supplied from a data line, which is enough to ensure the stable operation of the driving transistor, there arises another problem in that the power consumption of a data line driver circuit is increased.

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